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Share-Based Compensation (Schedule of Additional Data Related to Stock Option Activity) (Details) (Stock Options, USD $)
In Millions, unless otherwise specified
6 Months Ended 12 Months Ended
Dec. 31, 2014
Jun. 30, 2014
Stock Options
   
Aggregate intrinsic value of outstanding options at period end, Stock Options $ 329us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 282us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Aggregate intrinsic value of exercisable options at period end, Stock Options $ 246us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 185us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Weighted-average remaining contractual life of outstanding options 6 years 6 years
Weighted-average remaining contractual life of exercisable options 5 years 4 years